CVE-2026-126072

Action Pack is a framework for handling and responding to web requests. Prior to 8.1.4.1 and 8.0.5.2, ActionController::Live::Buffer#close pushes its end-of-stream marker onto the response's bounded queue while it holds the buffer's monitor. When the client has stopped reading and the queue is full, the push blocks, and Buffer#abort, which runs when the client disconnects or a write times out, waits indefinitely for the same monitor. Each such response could permanently hold a web server thread and its ActionController::Live thread, possibly resulting in a DoS vulnerability through thread exhaustion. Applications that stream responses with ActionController::Live, including send_stream, are affected. Applications that serve large files through Active Storage proxy mode are exposed to unauthenticated clients. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.

• CWE-833

• https://github.com/rails/rails/commit/27ad18ed5900dee28ba20e9c6fc718ff751fa215
• https://github.com/rails/rails/commit/ccbfc09690fef05fdd2a9969c917a71b92cc98fc
• https://github.com/rails/rails/releases/tag/v8.0.5.2
• https://github.com/rails/rails/releases/tag/v8.1.4.1
• https://github.com/rails/rails/security/advisories/GHSA-rwvh-fw6r-pwvp

Published

Nov 10, 2026

Last Modified

Nov 12, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-126066fast-xml-parser allows users to process XML from JS object w…3.7
• CVE-2026-126067Action Pack is a framework for handling and responding to we…3.1
• CVE-2026-126068Action Mailbox routes incoming emails to controller-like mai…3.7
• CVE-2026-126069Action View is a framework for handling view template lookup…4.7
• CVE-2026-126070Action View is a framework for handling view template lookup…6.1
• CVE-2026-126071Active Storage makes it simple to upload and reference files…5.3
• CVE-2026-126073Action Pack is a framework for handling and responding to we…4.8
• CVE-2026-126074Active Storage makes it simple to upload and reference files…4.3
• CVE-2026-126075Active Support is a collection of utility classes and standa…4.7
• CVE-2026-126076Action Pack is a framework for handling and responding to we…4.2
• CVE-2026-126077Action Pack is a framework for handling and responding to we…6.8
• CVE-2026-126078Action View is a framework for handling view template lookup…6.1